package com.hengpeng.msls.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

/**
 * <pre>
 * 微信请求校验工具类
 * </pre>
 * @author shenshaopeng
 * @version 1.0, 2014-3-4
 */
public class SignUtil
{
	// 与接口配置信息中的Token要一致
	private static String token = "fcdtWeixinCourse";    
	private static String szfcToken = "szfcWeixinCourse";
	private static String shfcToken = "shfcWeixinCourse";
	private static String tcdtToken ="tcdtWeixinCourse";    //体彩定投
	private static String szfcDyToken = "szfcDyWeixinCourse"; //深圳福彩订阅号
	private static String rcpToken="rcapWeixinCourse";  //瑞彩彩票
	private static String happyRuiCai="happyRuiCaiWeixinCourse";  //开心瑞彩
	private static String happyCaipiao="happyCaiPiaoWeixinCourse";  //开心彩票
	private static String xiangyuCaipiao="xiangyuCaiWeixinCourse";  //开心吉祥
	private static String aocairuiCaipiao="aocairuiWeixinCourse";  //奥彩瑞
	/**
	 * 验证签名
	 * @param signature
	 * @param timestamp
	 * @param nonce
	 * @return
	 */
	public static boolean checkSignature(String signature, String timestamp, String nonce,String type)
	{  
		String tok = token;
		if("1001".equals(type)){  //深圳福彩token
			tok=szfcToken;
		}else if("1002".equals(type)){  //体彩定投token
			tok=tcdtToken;
		}else if("1003".equals(type)){
			tok=shfcToken;	         //上海福彩
		}else if("1004".equals(type)){
			tok=szfcDyToken;
		}else if("1005".equals(type)){
			tok=rcpToken;
		}else if("1006".equals(type)){
			tok=happyRuiCai;
		}else if("1007".equals(type)){
			tok=happyCaipiao;
		}else if("1008".equals(type)){
			tok=xiangyuCaipiao;
		}else if("1009".equals(type)){
			tok=aocairuiCaipiao;
		}
		String[] arr = new String[] { tok, timestamp, nonce };
		// 将token、timestamp、nonce三个参数进行字典序排序
		Arrays.sort(arr);
		StringBuilder content = new StringBuilder();
		for (int i = 0; i < arr.length; i++)
		{
			content.append(arr[i]);
		}
		MessageDigest md = null;
		String tmpStr = null;

		try
		{
			md = MessageDigest.getInstance("SHA-1");
			// 将三个参数字符串拼接成一个字符串进行sha1加密
			byte[] digest = md.digest(content.toString().getBytes());
			tmpStr = byteToStr(digest);
		}
		catch (NoSuchAlgorithmException e)
		{
			e.printStackTrace();
		}

		content = null;
		// 将sha1加密后的字符串可与signature对比，标识该请求来源于微信
		return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;
	}

	/**
	 * 将字节数组转换为十六进制字符串
	 * @param byteArray
	 * @return
	 */
	private static String byteToStr(byte[] byteArray)
	{
		String strDigest = "";
		for (int i = 0; i < byteArray.length; i++)
		{
			strDigest += byteToHexStr(byteArray[i]);
		}
		return strDigest;
	}

	/**
	 * 将字节转换为十六进制字符串
	 * @param mByte
	 * @return
	 */
	private static String byteToHexStr(byte mByte)
	{
		char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
		char[] tempArr = new char[2];
		tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
		tempArr[1] = Digit[mByte & 0X0F];

		String s = new String(tempArr);
		return s;
	}
}
